Definition of occlusion in English:



  • 1Medicine
    The blockage or closing of a blood vessel or hollow organ.

    • ‘Two of the 4 patients with cirrhosis had hepatic infusion chemotherapy and therapeutic occlusion of hepatic arteries.’
    • ‘Localized observation of blood vessel stasis, occlusion or vessel dilation have all been observed with Photofrin treatment in vivo.’
    • ‘The occlusion rates are close to 100%, higher than published results for surgical ligation.’
    • ‘The blood vessel wall is usually involved early with resultant hemorrhage, thrombotic occlusion, and lung infarction.’
    • ‘Cardiac catheterization can confirm vascular occlusion and angioplasty is frequently used to treat a localized problem.’
    obstruction, stoppage, block, clot
    View synonyms
  • 2Meteorology
    [count noun] A process by which the cold front of a rotating low-pressure system catches up the warm front, so that the warm air between them is forced upwards off the earth's surface between wedges of cold air.

    • ‘In a cold occlusion, the reverse occurs and the occlusion resembles a cold front.’
    • ‘The second type is a warm occlusion, which occurs when the air behind the front is warmer than the air ahead of the front.’
    1. 2.1An occluded front.
      • ‘The meteorological language, which Doogan edits slightly, destabilizes into a poetry of cyclones, occlusions and disturbances.’
      • ‘In both types of occlusions, the occluded front has well defined vertical boundaries between the coldest air, the cool air, and the warm air.’
  • 3Dentistry
    The position of the teeth when the jaws are closed.

    • ‘The initial jaw position was obtained with the teeth in centric occlusion.’
    • ‘Posterior teeth may need to be replaced to restore occlusion.’
    • ‘The multi-cusped cheek teeth, complex occlusion and extensive palinal power stroke were well suited for shredding fibrous plant material.’
    • ‘The lowered position of these surfaces require downward flexion of the rostrum in order to maintain occlusion of upper and lower incisors.’


Mid 17th century: from Latin occlus- shut up (from the verb occludere) + -ion.